Ezekiel 45:18-20

18“This is what the Lord God says: In the first month, on the first day of the month, you are to take a young, unblemished bull and purify the sanctuary.

19The priest is to take some of the blood from the sin offering and apply it to the temple doorposts, the four corners of the altar’s ledge, and the doorposts of the gate of the inner court.

20You are to do the same thing on the seventh day of the month for everyone who sins unintentionally or through ignorance. In this way you will make atonement for the temple.